我有一个场景，我想在触摸通知框时显示我在通知框中显示的信息到新屏幕。我能够在手机上生成通知，但是当我触摸通知框时，我无法显示该通知消息，而是显示了一些旧消息。有人可以帮助我。
以下是我要开始的活动的代码：
public class MainActivity extends Activity {
// label to display gcm messages
TextView lblMessage;
// Asyntask
AsyncTask<Void, Void, Void> mRegisterTask;
// Alert dialog manager
AlertDialogManager alert = new AlertDialogManager();
// Connection detector
ConnectionDetector cd;
public static String name;
public static String email;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cd = new ConnectionDetector(getApplicationContext());
// Check if Internet present
if (!cd.isConnectingToInternet()) {
// Internet Connection is not present
alert.showAlertDialog(MainActivity.this,
"Internet Connection Error",
"Please connect to working Internet connection", false);
// stop executing code by return
return;
}
// Getting name, email from intent
Intent i = getIntent();
name = i.getStringExtra("name");
email = i.getStringExtra("email");
// Make sure the device has the proper dependencies.
GCMRegistrar.checkDevice(this);
// Make sure the manifest was properly set - comment out this line
// while developing the app, then uncomment it when it's ready.
GCMRegistrar.checkManifest(this);
lblMessage = (TextView) findViewById(R.id.lblMessage);
lblMessage.setText("");
String previous=i.getStringExtra("previous message");
if(!previous.equals("The Very Beginning"))
lblMessage.setText(previous);
registerReceiver(mHandleMessageReceiver, new IntentFilter(
DISPLAY_MESSAGE_ACTION));
// Get GCM registration id
final String regId = GCMRegistrar.getRegistrationId(this);
// Check if regid already presents
if (regId.equals("")) {
// Registration is not present, register now with GCM
GCMRegistrar.register(this, SENDER_ID);
} else {
// Device is already registered on GCM
if (GCMRegistrar.isRegisteredOnServer(this)) {
// Skips registration.
if(previous.equals("The Very Beginning"))
Toast.makeText(getApplicationContext(), "Already registered with GCM", Toast.LENGTH_LONG).show();
Log.v("Reg ID", regId);
} else {
// Try to register again, but not in the UI thread.
// It's also necessary to cancel the thread onDestroy(),
// hence the use of AsyncTask instead of a raw thread.
final Context context = this;
mRegisterTask = new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
// Register on our server
// On server creates a new user
ServerUtilities.register(context, name, email, regId);
return null;
}
@Override
protected void onPostExecute(Void result) {
mRegisterTask = null;
}
};
mRegisterTask.execute(null, null, null);
}
}
}
/**
* Receiving push messages
* */
private final BroadcastReceiver mHandleMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String newMessage = intent.getExtras().getString(EXTRA_MESSAGE);
// Waking up mobile if it is sleeping
WakeLocker.acquire(getApplicationContext());
/**
* Take appropriate action on this message
* depending upon your app requirement
* For now i am just displaying it on the screen
* */
// Showing received message
lblMessage.setText(newMessage + "\n");
Toast.makeText(getApplicationContext(), "New Message: " + newMessage, Toast.LENGTH_LONG).show();
// Releasing wake lock
WakeLocker.release();
}
};
@Override
protected void onDestroy() {
if (mRegisterTask != null) {
mRegisterTask.cancel(true);
}
try {
unregisterReceiver(mHandleMessageReceiver);
GCMRegistrar.onDestroy(this);
} catch (Exception e) {
Log.e("UnRegister Receiver Error", "> " + e.getMessage());
}
super.onDestroy();
}
}
以下是GCM Broadcast课程的代码：
import com.google.android.gcm.GCMBaseIntentService;
public class GCMIntentService extends GCMBaseIntentService {
private static final String TAG = "GCMIntentService";
public GCMIntentService() {
super(SENDER_ID);
}
/**
* Method called on device registered
**/
@Override
protected void onRegistered(Context context, String registrationId) {
Log.i(TAG, "Device registered: regId = " + registrationId);
displayMessage(context, "Your device registred with GCM");
Log.d("NAME", MainActivity.name);
ServerUtilities.register(context, MainActivity.name, MainActivity.email, registrationId);
}
/**
* Method called on device un registred
* */
@Override
protected void onUnregistered(Context context, String registrationId) {
Log.i(TAG, "Device unregistered");
displayMessage(context, getString(R.string.gcm_unregistered));
ServerUtilities.unregister(context, registrationId);
}
/**
* Method called on Receiving a new message
* */
@Override
protected void onMessage(Context context, Intent intent) {
Log.i(TAG, "Received message");
String message = intent.getExtras().getString("message");
displayMessage(context, message);
// notifies user
generateNotification(context, message);
}
/**
* Method called on receiving a deleted message
* */
@Override
protected void onDeletedMessages(Context context, int total) {
Log.i(TAG, "Received deleted messages notification");
String message = getString(R.string.gcm_deleted, total);
displayMessage(context, message);
// notifies user
generateNotification(context, message);
}
/**
* Method called on Error
* */
@Override
public void onError(Context context, String errorId) {
Log.i(TAG, "Received error: " + errorId);
displayMessage(context, getString(R.string.gcm_error, errorId));
}
@Override
protected boolean onRecoverableError(Context context, String errorId) {
// log message
Log.i(TAG, "Received recoverable error: " + errorId);
displayMessage(context, getString(R.string.gcm_recoverable_error,
errorId));
return super.onRecoverableError(context, errorId);
}
/**
* Issues a notification to inform the user that server has sent a message.
*/
private static void generateNotification(Context context, String message) {
int icon = R.drawable.ic_launcher;
long when = System.currentTimeMillis();
NotificationManager notificationManager = (NotificationManager)
context.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new Notification(icon, message, when);
String title = context.getString(R.string.app_name);
Intent notificationIntent = new Intent(context, MainActivity.class);
// set intent so it does not start a new activity
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
Intent.FLAG_ACTIVITY_SINGLE_TOP);
//Here to
notificationIntent.putExtra("previous message", message);
//Here
PendingIntent intent =
PendingIntent.getActivity(context, 0, notificationIntent, 0);
notification.setLatestEventInfo(context, title, message, intent);
notification.flags |= Notification.FLAG_AUTO_CANCEL;
// Play default notification sound
notification.defaults |= Notification.DEFAULT_SOUND;
//notification.sound = Uri.parse("android.resource://" + context.getPackageName() + "your_sound_file_name.mp3");
// Vibrate if vibrate is enabled
notification.defaults |= Notification.DEFAULT_VIBRATE;
notificationManager.notify(0, notification);
}
}
答案 0 :(得分：1)
您正在使用以下标志：
FLAG_ACTIVITY_CLEAR_TOP
如果已设置，并且正在启动的活动已在当前任务中运行，则不会启动该活动的新实例，而是将关闭其上的所有其他活动，并将此Intent传递给（现在在最前面）作为新意图的旧活动。
FLAG_ACTIVITY_SINGLE_TOP
如果设置，如果活动已经在历史堆栈的顶部运行，则不会启动该活动。
这意味着如果您尝试打开的活动已在运行，则不会创建新活动，并且现有活动将位于顶部。这就是为什么不执行onCreate并且不显示新消息的原因。您可以使用不同的标志（强制创建新活动），也可以使用其他方法（例如onResume）更新消息。
答案 1 :(得分：0)
还覆盖onNewIntent。活动不立即销毁。例如（适用于我的代码）：
通知：
private int m_notifyId = 0;
private void noti() {
m_notifyId++;
if (m_notifyId == Integer.MAX_VALUE) // ha ha
m_notifyId = 1;
NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification noti = new Notification(android.R.drawable.ic_menu_agenda, "Notification Alert", System.currentTimeMillis());
Intent notifyIntent = new Intent(this, NotificationReceiver.class);
notifyIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
notifyIntent.putExtra("test", "notification");
double d = m_random.nextDouble();
notifyIntent.putExtra("double", d);
// despite that docs says that requestCode is not used in getActivity
// it is actually used. Try with same requestCode.
PendingIntent pendingIntent = PendingIntent.getActivity(this, m_notifyId, notifyIntent, PendingIntent.FLAG_ONE_SHOT);
noti.setLatestEventInfo(getApplicationContext(), (CharSequence)"Notification", (CharSequence)("Notification: " + d), pendingIntent);
noti.flags |= Notification.FLAG_AUTO_CANCEL;
nm.notify(m_notifyId, noti);
}
处理
private TextView m_tvInfo;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.notification_receiver_main);
m_tvInfo = (TextView) findViewById(R.id.tvInfo);
Intent intent = getIntent();
Log.d("log", "onCreate getIntent");
// check if extras contains the key.
String test = intent.getExtras().getString("test");
test += "\n" + Double.toString(intent.getExtras().getDouble("double"));
m_tvInfo.setText(test);
}
@Override
protected void onNewIntent(Intent intent) {
setIntent(intent); // maybe not needed. depends on the activity logic.
Log.d("log", "onNewIntent");
String test = intent.getExtras().getString("test");
test += "\n" + Double.toString(intent.getExtras().getDouble("double"));
m_tvInfo.setText(test);
}
NB。 imho和旧代码。